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/// \file exampleB1.cc
/// \brief Main program of the B1 example

#include "ActionInitialization.hh"
#include "DetectorConstruction.hh"
#include "G4RunManagerFactory.hh"
#include "G4SteppingVerbose.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "QBBC.hh"
// #include "Randomize.hh"

int evtid = 0;  //定义外部变量，用于记录当前Event的序号

using namespace B1;

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int main(int argc, char** argv)
{
    ///====================================== Detect interactive mode (if no arguments) and define UI session
    /* - argc 是命令行参数的个数. argv[0] 是程序自身路径, 所以 argc == 1
   表示用户运行程序时没有额外传入任何参数.
   - 如果没有传入参数(argc == 1), 就创建一个 G4UIExecutive 对象 ui.
    G4UIExecutive 是 Geant4 提供的交互式图形用户界面(GUI)管理器,
   它会弹出一个命令窗口, 允许用户通过输入 Geant4 命令(如 /run/beamOn
   100)来控制模拟过程.
   - 如果传入了参数(例如 ./exampleB1 run1.mac), 则 ui 保持为nullptr,
   程序会进入批处理模式(batch mode), 直接执行传入的宏文件(如run1.mac),
   不启动交互界面.
  */
    G4UIExecutive* ui = nullptr;
    if (argc == 1)
    {
        ui = new G4UIExecutive(argc, argv);
    }

    /// 可选: 选择不同的随机数引擎 Random engine...
    // G4Random::setTheEngine(new CLHEP::MTwistEngine);

    ///=============================================== use G4SteppingVerboseWithUnits
    G4int precision = 4;
    G4SteppingVerbose::UseBestUnit(precision);

///=============================================== Construct the default run manager
#if 0
    auto runManager = G4RunManagerFactory::CreateRunManager(G4RunManagerType::Default);
#else
    //采用多线程RunManager
    auto runManager = G4RunManagerFactory::CreateRunManager(G4RunManagerType::MT);
    auto nThreads = G4Threading::G4GetNumberOfCores();  //获取本机上的逻辑处理器的个数
    nThreads = std::max(1, nThreads);
    runManager->SetNumberOfThreads(nThreads);
//设置线程数为逻辑处理器的个数，也可以自行设置为其他正整数
#endif
    ///00000000000000000000000000000000000000000000000000000000 Set mandatory initialization classes
    ///=============================== Detector construction; 材料信息, 包括屏蔽材料, 探测器等等
    /// 通过RunManager指定本次Run中的所有材料，即DetectorConstruction类的对象
    runManager->SetUserInitialization(new DetectorConstruction());

    ///======================================= Physics list;
    /// 通过RunManager指定本次Run中的相互作用列表
    auto physicsList = new QBBC;
    physicsList->SetVerboseLevel(1);
    /// 通过RunManager指定本次Run中的相互作用列表
    runManager->SetUserInitialization(physicsList);

    ///============================= User action initialization
    // 一般在多线程中使用，非多线程程序可直接在main函数中指定上述对象，方法与材料的指定方法相同
    runManager->SetUserInitialization(new ActionInitialization());

    ///=============================== 初始化图形交互界面(Visualization UI)
    /// Initialize visualization with the default graphics system
    auto visManager = new G4VisExecutive(argc, argv);
    // Constructors can also take optional arguments:
    // - a graphics system of choice, eg. "OGL"
    // - and a verbosity argument - see /vis/verbose guidance.
    // auto visManager = new G4VisExecutive(argc, argv, "OGL", "Quiet");
    // auto visManager = new G4VisExecutive("Quiet");
    visManager->Initialize();

    /// Get the pointer to the User Interface manager
    /// 初始化负责执行用户输入命令的 manager
    auto UImanager = G4UImanager::GetUIpointer();

    // Process macro or start UI session
    //
    if (!ui)
    {
        /// batch mode
        G4String command = "/control/execute ";
        G4String fileName = argv[1];
        UImanager->ApplyCommand(command + fileName);
    }
    else
    {
        /// interactive mode
        UImanager->ApplyCommand("/control/execute init_vis.mac");
        ui->SessionStart();
        delete ui;
    }

    /// Job termination
    // Free the store: user actions, physics_list and detector_description are
    // owned and deleted by the run manager, so they should not be deleted in the main() program !
    delete visManager;
    delete runManager;
}

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